Function Pointer_stringify

test/tests/emscripten/readdir_empty.js:645–675

(ptr, /* optional */ length)

Module["getMemory"] = getMemory;

function Pointer_stringify(ptr, /* optional */ length) {
  if (length === 0 || !ptr) return '';
  // TODO: use TextDecoder
  // Find the length, and check for UTF while doing so
  var hasUtf = 0;
  var t;
  var i = 0;
  while (1) {
    t = HEAPU8[(((ptr)+(i))>>0)];
    hasUtf |= t;
    if (t == 0 && !length) break;
    i++;
    if (length && i == length) break;
  }
  if (!length) length = i;

  var ret = '';

  if (hasUtf < 128) {
    var MAX_CHUNK = 1024; // split up into chunks, because .apply on a huge string can overflow the stack
    var curr;
    while (length > 0) {
      curr = String.fromCharCode.apply(String, HEAPU8.subarray(ptr, ptr + Math.min(length, MAX_CHUNK)));
      ret = ret ? ret + curr : curr;
      ptr += MAX_CHUNK;
      length -= MAX_CHUNK;
    }
    return ret;
  }
  return Module['UTF8ToString'](ptr);
}
Module["Pointer_stringify"] = Pointer_stringify;

// Given a pointer 'ptr' to a null-terminated ASCII-encoded string in the emscripten HEAP, returns